arch/sh/kernel/cpu/sh4a/clock-sh7724.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4a/clock-sh7724.c
   3  *
   4  * SH7724 clock framework support
   5  *
   6  * Copyright (C) 2009 Magnus Damm
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/io.h>
  24 #include <asm/clock.h>
  25 #include <asm/hwblk.h>
  26 #include <cpu/sh7724.h>
  27
  28 /* SH7724 registers */
  29 #define FRQCRA          0xa4150000
  30 #define FRQCRB          0xa4150004
  31 #define VCLKCR          0xa4150048
  32 #define FCLKACR         0xa4150008
  33 #define FCLKBCR         0xa415000c
  34 #define IRDACLKCR       0xa4150018
  35 #define PLLCR           0xa4150024
  36 #define SPUCLKCR        0xa415003c
  37 #define FLLFRQ          0xa4150050
  38 #define LSTATS          0xa4150060
  39
  40 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
  41 static struct clk r_clk = {
  42         .name           = "rclk",
  43         .id             = -1,
  44         .rate           = 32768,
  45 };
  46
  47 /*
  48  * Default rate for the root input clock, reset this with clk_set_rate()
  49  * from the platform code.
  50  */
  51 struct clk extal_clk = {
  52         .name           = "extal",
  53         .id             = -1,
  54         .rate           = 33333333,
  55 };
  56
  57 /* The fll multiplies the 32khz r_clk, may be used instead of extal */
  58 static unsigned long fll_recalc(struct clk *clk)
  59 {
  60         unsigned long mult = 0;
  61         unsigned long div = 1;
  62
  63         if (__raw_readl(PLLCR) & 0x1000)
  64                 mult = __raw_readl(FLLFRQ) & 0x3ff;
  65
  66         if (__raw_readl(FLLFRQ) & 0x4000)
  67                 div = 2;
  68
  69         return (clk->parent->rate * mult) / div;
  70 }
  71
  72 static struct clk_ops fll_clk_ops = {
  73         .recalc         = fll_recalc,
  74 };
  75
  76 static struct clk fll_clk = {
  77         .name           = "fll_clk",
  78         .id             = -1,
  79         .ops            = &fll_clk_ops,
  80         .parent         = &r_clk,
  81         .flags          = CLK_ENABLE_ON_INIT,
  82 };
  83
  84 static unsigned long pll_recalc(struct clk *clk)
  85 {
  86         unsigned long mult = 1;
  87
  88         if (__raw_readl(PLLCR) & 0x4000)
  89                 mult = (((__raw_readl(FRQCRA) >> 24) & 0x3f) + 1) * 2;
  90
  91         return clk->parent->rate * mult;
  92 }
  93
  94 static struct clk_ops pll_clk_ops = {
  95         .recalc         = pll_recalc,
  96 };
  97
  98 static struct clk pll_clk = {
  99         .name           = "pll_clk",
 100         .id             = -1,
 101         .ops            = &pll_clk_ops,
 102         .flags          = CLK_ENABLE_ON_INIT,
 103 };
 104
 105 /* A fixed divide-by-3 block use by the div6 clocks */
 106 static unsigned long div3_recalc(struct clk *clk)
 107 {
 108         return clk->parent->rate / 3;
 109 }
 110
 111 static struct clk_ops div3_clk_ops = {
 112         .recalc         = div3_recalc,
 113 };
 114
 115 static struct clk div3_clk = {
 116         .name           = "div3_clk",
 117         .id             = -1,
 118         .ops            = &div3_clk_ops,
 119         .parent         = &pll_clk,
 120 };
 121
 122 struct clk *main_clks[] = {
 123         &r_clk,
 124         &extal_clk,
 125         &fll_clk,
 126         &pll_clk,
 127         &div3_clk,
 128 };
 129
 130 static void div4_kick(struct clk *clk)
 131 {
 132         unsigned long value;
 133
 134         /* set KICK bit in FRQCRA to update hardware setting */
 135         value = __raw_readl(FRQCRA);
 136         value |= (1 << 31);
 137         __raw_writel(value, FRQCRA);
 138 }
 139
 140 static int divisors[] = { 2, 3, 4, 6, 8, 12, 16, 0, 24, 32, 36, 48, 0, 72 };
 141
 142 static struct clk_div_mult_table div4_div_mult_table = {
 143         .divisors = divisors,
 144         .nr_divisors = ARRAY_SIZE(divisors),
 145 };
 146
 147 static struct clk_div4_table div4_table = {
 148         .div_mult_table = &div4_div_mult_table,
 149         .kick = div4_kick,
 150 };
 151
 152 enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_P, DIV4_M1, DIV4_NR };
 153
 154 #define DIV4(_str, _reg, _bit, _mask, _flags) \
 155   SH_CLK_DIV4(_str, &pll_clk, _reg, _bit, _mask, _flags)
 156
 157 struct clk div4_clks[DIV4_NR] = {
 158         [DIV4_I] = DIV4("cpu_clk", FRQCRA, 20, 0x2f7d, CLK_ENABLE_ON_INIT),
 159         [DIV4_SH] = DIV4("shyway_clk", FRQCRA, 12, 0x2f7c, CLK_ENABLE_ON_INIT),
 160         [DIV4_B] = DIV4("bus_clk", FRQCRA, 8, 0x2f7c, CLK_ENABLE_ON_INIT),
 161         [DIV4_P] = DIV4("peripheral_clk", FRQCRA, 0, 0x2f7c, 0),
 162         [DIV4_M1] = DIV4("vpu_clk", FRQCRB, 4, 0x2f7c, CLK_ENABLE_ON_INIT),
 163 };
 164
 165 struct clk div6_clks[] = {
 166         SH_CLK_DIV6("video_clk", &div3_clk, VCLKCR, 0),
 167         SH_CLK_DIV6("fsia_clk", &div3_clk, FCLKACR, 0),
 168         SH_CLK_DIV6("fsib_clk", &div3_clk, FCLKBCR, 0),
 169         SH_CLK_DIV6("irda_clk", &div3_clk, IRDACLKCR, 0),
 170         SH_CLK_DIV6("spu_clk", &div3_clk, SPUCLKCR, CLK_ENABLE_ON_INIT),
 171 };
 172
 173 #define R_CLK (&r_clk)
 174 #define P_CLK (&div4_clks[DIV4_P])
 175 #define B_CLK (&div4_clks[DIV4_B])
 176 #define I_CLK (&div4_clks[DIV4_I])
 177 #define SH_CLK (&div4_clks[DIV4_SH])
 178
 179 static struct clk mstp_clks[] = {
 180         SH_HWBLK_CLK("tlb0", -1, I_CLK, HWBLK_TLB, CLK_ENABLE_ON_INIT),
 181         SH_HWBLK_CLK("ic0", -1, I_CLK, HWBLK_IC, CLK_ENABLE_ON_INIT),
 182         SH_HWBLK_CLK("oc0", -1, I_CLK, HWBLK_OC, CLK_ENABLE_ON_INIT),
 183         SH_HWBLK_CLK("rs0", -1, B_CLK, HWBLK_RSMEM, CLK_ENABLE_ON_INIT),
 184         SH_HWBLK_CLK("ilmem0", -1, I_CLK, HWBLK_ILMEM, CLK_ENABLE_ON_INIT),
 185         SH_HWBLK_CLK("l2c0", -1, SH_CLK, HWBLK_L2C, CLK_ENABLE_ON_INIT),
 186         SH_HWBLK_CLK("fpu0", -1, I_CLK, HWBLK_FPU, CLK_ENABLE_ON_INIT),
 187         SH_HWBLK_CLK("intc0", -1, P_CLK, HWBLK_INTC, CLK_ENABLE_ON_INIT),
 188         SH_HWBLK_CLK("dmac0", -1, B_CLK, HWBLK_DMAC0, 0),
 189         SH_HWBLK_CLK("sh0", -1, SH_CLK, HWBLK_SHYWAY, CLK_ENABLE_ON_INIT),
 190         SH_HWBLK_CLK("hudi0", -1, P_CLK, HWBLK_HUDI, 0),
 191         SH_HWBLK_CLK("ubc0", -1, I_CLK, HWBLK_UBC, 0),
 192         SH_HWBLK_CLK("tmu0", -1, P_CLK, HWBLK_TMU0, 0),
 193         SH_HWBLK_CLK("cmt0", -1, R_CLK, HWBLK_CMT, 0),
 194         SH_HWBLK_CLK("rwdt0", -1, R_CLK, HWBLK_RWDT, 0),
 195         SH_HWBLK_CLK("dmac1", -1, B_CLK, HWBLK_DMAC1, 0),
 196         SH_HWBLK_CLK("tmu1", -1, P_CLK, HWBLK_TMU1, 0),
 197         SH_HWBLK_CLK("scif0", -1, P_CLK, HWBLK_SCIF0, 0),
 198         SH_HWBLK_CLK("scif1", -1, P_CLK, HWBLK_SCIF1, 0),
 199         SH_HWBLK_CLK("scif2", -1, P_CLK, HWBLK_SCIF2, 0),
 200         SH_HWBLK_CLK("scif3", -1, B_CLK, HWBLK_SCIF3, 0),
 201         SH_HWBLK_CLK("scif4", -1, B_CLK, HWBLK_SCIF4, 0),
 202         SH_HWBLK_CLK("scif5", -1, B_CLK, HWBLK_SCIF5, 0),
 203         SH_HWBLK_CLK("msiof0", -1, B_CLK, HWBLK_MSIOF0, 0),
 204         SH_HWBLK_CLK("msiof1", -1, B_CLK, HWBLK_MSIOF1, 0),
 205
 206         SH_HWBLK_CLK("keysc0", -1, R_CLK, HWBLK_KEYSC, 0),
 207         SH_HWBLK_CLK("rtc0", -1, R_CLK, HWBLK_RTC, 0),
 208         SH_HWBLK_CLK("i2c0", -1, P_CLK, HWBLK_IIC0, 0),
 209         SH_HWBLK_CLK("i2c1", -1, P_CLK, HWBLK_IIC1, 0),
 210
 211         SH_HWBLK_CLK("mmc0", -1, B_CLK, HWBLK_MMC, 0),
 212         SH_HWBLK_CLK("eth0", -1, B_CLK, HWBLK_ETHER, 0),
 213         SH_HWBLK_CLK("atapi0", -1, B_CLK, HWBLK_ATAPI, 0),
 214         SH_HWBLK_CLK("tpu0", -1, B_CLK, HWBLK_TPU, 0),
 215         SH_HWBLK_CLK("irda0", -1, P_CLK, HWBLK_IRDA, 0),
 216         SH_HWBLK_CLK("tsif0", -1, B_CLK, HWBLK_TSIF, 0),
 217         SH_HWBLK_CLK("usb1", -1, B_CLK, HWBLK_USB1, 0),
 218         SH_HWBLK_CLK("usb0", -1, B_CLK, HWBLK_USB0, 0),
 219         SH_HWBLK_CLK("2dg0", -1, B_CLK, HWBLK_2DG, 0),
 220         SH_HWBLK_CLK("sdhi0", -1, B_CLK, HWBLK_SDHI0, 0),
 221         SH_HWBLK_CLK("sdhi1", -1, B_CLK, HWBLK_SDHI1, 0),
 222         SH_HWBLK_CLK("veu1", -1, B_CLK, HWBLK_VEU1, 0),
 223         SH_HWBLK_CLK("ceu1", -1, B_CLK, HWBLK_CEU1, 0),
 224         SH_HWBLK_CLK("beu1", -1, B_CLK, HWBLK_BEU1, 0),
 225         SH_HWBLK_CLK("2ddmac0", -1, SH_CLK, HWBLK_2DDMAC, 0),
 226         SH_HWBLK_CLK("spu0", -1, B_CLK, HWBLK_SPU, 0),
 227         SH_HWBLK_CLK("jpu0", -1, B_CLK, HWBLK_JPU, 0),
 228         SH_HWBLK_CLK("vou0", -1, B_CLK, HWBLK_VOU, 0),
 229         SH_HWBLK_CLK("beu0", -1, B_CLK, HWBLK_BEU0, 0),
 230         SH_HWBLK_CLK("ceu0", -1, B_CLK, HWBLK_CEU0, 0),
 231         SH_HWBLK_CLK("veu0", -1, B_CLK, HWBLK_VEU0, 0),
 232         SH_HWBLK_CLK("vpu0", -1, B_CLK, HWBLK_VPU, 0),
 233         SH_HWBLK_CLK("lcdc0", -1, B_CLK, HWBLK_LCDC, 0),
 234 };
 235
 236 int __init arch_clk_init(void)
 237 {
 238         int k, ret = 0;
 239
 240         /* autodetect extal or fll configuration */
 241         if (__raw_readl(PLLCR) & 0x1000)
 242                 pll_clk.parent = &fll_clk;
 243         else
 244                 pll_clk.parent = &extal_clk;
 245
 246         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 247                 ret = clk_register(main_clks[k]);
 248
 249         if (!ret)
 250                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 251
 252         if (!ret)
 253                 ret = sh_clk_div6_register(div6_clks, ARRAY_SIZE(div6_clks));
 254
 255         if (!ret)
 256                 ret = sh_hwblk_clk_register(mstp_clks, ARRAY_SIZE(mstp_clks));
 257
 258         return ret;
 259 }